
31
2. Trouble in Power on
No
No
Yes
Yes
Is 5VS line
normal(pin 8
of J3)?
Trouble in U7 & Q3
and its ambient circuit.
Check the power board
(5VS of J3).
Check on Scaler(U9).
Is the
Power LED toggled
between on and
off?
Off
No
Yes
On
Is the power
cord well
connected?
Refer to No video
or No raster.
Check if the power switch
is on position and
Connect the power
cord correctly.
Check the
waveform of pin 8
of -com(U6).
Trouble in
Power on
Yes
Summary of Contents for L520B
Page 36: ...34 5 No Video ...
Page 42: ...40 TDA 8752 Section SCHEMATIC DIAGRAM ...
Page 43: ...DVI Receiver Section 41 ...
Page 44: ...Video Decoder Section 42 ...
Page 45: ...Micro Controller Section 43 ...
Page 46: ...ASI 310 Section 44 ...
Page 47: ...LCD Panel Interface Section 45 ...
Page 48: ...Power Distribution Section 46 ...
Page 49: ...Jack PCB Section 47 ...
Page 50: ...Key and TV Tuner Section 48 ...
Page 51: ...EXPLODED VIEW MECHANICAL PARTS LIST 49 ...
Page 72: ......